7881266692861 has 16 divisors (see below), whose sum is σ = 8141838211584. Its totient is φ = 7624558678464.

The previous prime is 7881266692841. The next prime is 7881266692903. The reversal of 7881266692861 is 1682966621887.

It is a cyclic number.

It is not a de Polignac number, because 7881266692861 - 2³³ = 7872676758269 is a prime.

It is a super-2 number, since 2×7881266692861² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7881266692841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197026 + ... + 3975091.

It is an arithmetic number, because the mean of its divisors is an integer number (508864888224).

Almost surely, 2^{7881266692861} is an apocalyptic number.

It is an amenable number.

7881266692861 is a deficient number, since it is larger than the sum of its proper divisors (260571518723).

7881266692861 is a wasteful number, since it uses less digits than its factorization.

7881266692861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4172580.

The product of its digits is 167215104, while the sum is 70.

The spelling of 7881266692861 in words is "seven trillion, eight hundred eighty-one billion, two hundred sixty-six million, six hundred ninety-two thousand, eight hundred sixty-one".